PFN CERAMICS SYNTHESIZED BY A TWO-STAGE METHOD

摘要

In the work the Pb(Fe_(1/2)Nb_(1/2))O_3 ceramics was obtained by a two-stage synthesizing method (columbite method). During the technological process the synthesis took place as a result of powder calcination method. An influence of technological conditions of the first stage of the ferroniobate (FeNbO_4) synthesizing on the crystalline structure, the microstructure, the internal friction and relative density (ρ_(eksp)/ρ_(teor)) was presented, and they influence basic properties of (ε(T) and tan δ(T), T_m, S(E), P{E)) and electric conduction of the PFN ceramics. It has been found that a high temperature of the FeNbO_4 synthesizing does not improve properties of the material and the optimum parameters of the PFN ceramics are obtained while synthesizing f FeNbO_4 at the temperature of 1000 °C for 4 h.